Lifting-jack



(N0 Model.)

HOLMES. 4

LIPTING JACK,

No. 535,903. Patented Mar. 19, 1895.

UNITED STATE PATENT @nrrcnt MILO P. HOLMES, OF SAN FRANCISCO,CALIFORNIA.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent N 0. 535,903, dated March19, 1895. Application filed February 20, 1894. Serial No. 500,878. (Nomodel.)

To all whom it may concern:

Be it known that I, MILO P. HOLMES, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented certain new and useful Improvements in Lifting-Jacks, ofwhich the following is a specification.

My invention relates to improvements in lifting jacks for raising wagonsand trucks, moving machinery, replacing cars on tracks and other similarwork.

It is an improvement on the lifting-jack for which Letters Patentof theUnited States were issued to me on the 19th day of August, 1890,numbered 434,712, and it consists in certain novel construction andcombination of the post or standard, in means for holding thelifting-lever, and in novel means for holding the movable dog or rest atany point on the standard independently of the liftingbar whereby thelever can be withdrawn and shifted to take afresh lift on the dog.

The nature of these improvements and the manner in which I construct andproduce the same will be understood from the following description andthe accompanying drawings which is referred to by figures and letters.

Figure 1 represents a lifting-jack constructedaccording to my inventionwith the movable dog or rest locked on the standard and withthe liftinglever setting clear of the dog. Fig. 2 is a side-view of the same partsshowing the lifting-lever removed from the standard. Fig. 3 is afront-view on an enlarged scale looking toward the notched edges of thestandard, and showing the top and the bottom ends of the standard andthe base partly in section. Fig. 3 is a top-view of the standard lookingdown upon the upper end. Fig. e is a plan of the base, the upright barsthat form the standard being cut ofi just above the base. Fig. 5 is aview of the movable dog or restin longitudinal section. Fig. 6 is aperspective View of the same piece.

The frame or standard ofmy lifting jack is composed of the flat barsA-A- united by a spacing-block of metal at the upper end, and byscrew-bolts near the bottom, and having notches or teeth a. -a along oneedge to form rests and bearing-points for the fulcrum-pin fof thelifting-lever. The lower ends of the uprights are fixed in thebase-plate -C by bolts set through the bars and through the centralupright Web C The slidable lifting-dog or rest -D differs from thecorresponding piece in other lifting jacks of this description in beingformed with a central web D- dividing it inside into two separatesockets, one for each upright-bar of the standard. The addition of thispiece serves to keep the toe in position and to overcome the tendency totwist or set out of line while being lifted by the lever as well as toincrease the strength of this piece. 0n the back of this piece D areformed ears -d* to which are attached by a loose joint -d alocking-piece composed of a latch --E having an eye in one end toreceive the pin d of the joint, and at the other end a cross-bar E ofsuitable length of projection to take into the notches in both bars ofthe standard, when the piece -E is turned up perpendicularly as shown inFig. 1.

The lifting-lever F is of the usual construction with a curvedcam-shaped lower end and a handle-portion on the upper end and with afulcrum-pin -F properly formed to set into the notches of the standard.The lever is of suitable thickness to fit in and work smoothly in theslot or opening between the side-bars A- of the standard.

On the front or inner edge of the liftinglever is formed or fixedafinger or projection --G standing out perpendicularly and also rigidlyfrom the lever over and in line with the camshaped end below, and thispiece Gin thickness corresponds with the width of space between theparallel inner faces of the two uprights of the standard and exceedsvery slightly such width between the uprights,

so that while the finger will enter between the two uprights it isnecessary to exert some pressure against the lever when in uprightposition, in order to force the finger into the slot or opening betweenthe. uprights. The finger being thus-tightly fitted to the slot will actto hold the lever in position when it is turned upright, andconsequently the lever cannot drop down as long as the finger sets intothe slot and it will remain in whatever position it is shifted and setalong the standard.

The dog or rest -=-D- on which is set the axle or other part to beraised can be locked at any point along the standard by turning up ICCthe latch -E, and setting the cross-bar E on the end into the notches onthe edge of the standard, and the weight on the toe-piece bein g thussustained by the latch, it will be seen that the lever F can be shiftedalong the standard to take a fresh hold for another lift.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,is 1

1. In a lifting-jack, the slotted standard composed of the upright barsAA provided with spaced notches on the edges, the base-plate O having acentral-up right web C setting between the ends of the upright and towhich the said bars are bolted, and the spacing-blockbetween the upperends of the said bars, in combination with a slidable-dog embracing andmovable on the said bars of the standard, and the lifting-lever F-havingacamshaped lower end adapted to work between the said bars of thestandard, and a cross-pin F fitting into the notches of the said barsand forming a fulcrum-point for the lever; the said cam-shaped end ofthe lever and the lifting-dog being disconnected from each other,whereby one part may be shifted and adjusted independently of the otherpart, substantially as shown and described.

2. In a lifting-jack, the combinationwvith the slotted standard formedof parallel bars AAwith notches on their upright edges, of theslidable-dog D- embracing the said bars, and having its central openingdivided by 2L-W6b that is fitted to move between the said bars, thehinged latch E on the heel of the said part D- adapted to engage thenotches in the standard and the lifting-lever F- provided with acamshaped end to act against the part D and a fulcrum-pin 6 F fitted tothe standard, said lever being adjustable in the standard independentlyof the part- D, substantially as shown and de scribed.

, 3. In a lifting-jack, the, combination with 5 a notched standard of aslidable-dog, a lifting-lever having a fulcrum-pin to engage the saidnotches and provided with a cam-shaped end which is adapted to setagainst and raise said dog on the standard by contact with that saidpiece and by the movement of the lever on its fulcrum-pin, and thehinged-latch on the slidable-dog as a means for locking the said dog onthe standard and holding it at any point thereon independently of theliftinglever, substantially as shown and described.

4. The herein-described lifting-jack comprising the standard formed ofthe parallel bars -AA-- provided with notches on their upright edges,the slidable-dog D embrac- 6o ing the said bars and having a central webin the space between the bars of the standard, the lifting-lever Fsetting between the said bars, and having at one end a camshaped partand a fulcrum pin F and at the opposite end the projecting finger G, andthe hinged latch -E on the back of the slidable-dog provided with thecross-bar E engaging the notches of the standard constructed andarranged for operation as 7: shown and described.

In testimony that I claim the foregoing I have hereunto set my hand andseal.

MILO P. HOLMES. [L. s]

Witnesses:

O. W. M. SMITH, CHAS. E. KELLY.

